Dead motherboard or something else?

[sickman44]

Hi,today I had an accident with my computer.It starting lagging unresponsively so I restarted it once.It happened again,but this time I accidently pushed my leg into the computer while it was working.It wasn't a strong hit,it was on the side of the box(where there is no contact to the components inside).The screen on the monitor froze and the computer showed no signs of work.
So I just hit the restart button,but this time from that my computer failed to start-it turns on,then turns off and restarts.The computer was hit harder before accidently again,and did not do that.I tried various tests.I replaced CMOS battery and jumper-restarting.Removed GPU and used onboard one-restarting.No harddisk-restarting.Removed RAM memory and left it only with the CPU and no beep sounds as expected.With all components,it sounds like normal boot-up.After removing CMOS(I removed it totally 3 times)-the GPU in boot several times was at 100 % fan.Tommorow,I'll get the computer to repair,but I wanted to ask also here.All the times-no work on the screen at all.What might happened-is the motherboard failing,the HDD,RAM or PSU?

Specs:
Core i3-3220 3.3 GHz
Asrock H61M-DGS
Gigabyte GTX 660 2GB PCI-E
Seagate 2000 GB SATA HDD
8GB RAM
Fortron 650 W PSU
SuperWriteMaster writing device(might be it failing?I touched it's button and it came out.)

 

[oajarmeh95]

i think the problem in the HDD because it is sensitive part and when you hit the computer you damaged it even it wasn't that strong